It is most likely because you have not yet activated the other available Virtual Accounts from your Xendit dashboard.

You need to activate the Virtual Account Range by following these steps:
a. Xendit Dashboard
b. Settings
c. Accepting Money
d. Payment Methods
e. Virtual accounts
f. Click on the "Activate!" button.

Or you could follow these steps instead:
a. Xendit Dashboard
b. Add Payment Methods
c. Virtual accounts